I want to power a uC project (uC is a STM32, supposed to be powered with 3.3V) over a LiPo battery. Since LiPo's output ranges from 4.2 volts to 3.7 volts, I feel unsure whether to use a step-down or a step-up converter, i.e. step-down or a step-up.
In the data sheet of the TPS63031, I saw in one characteristic (at the first page) an example of 3.3 V out for 3.6 V in, but I couldn't understand if this step-up converter, would also 'step-down' the maximum 4.2 volts to 3.3 volts.
Maybe I just misunderstood how DC-DC converters can be operated, since I thought for up- or down-converters, you always have to be significantly below your target voltage.
Thank you all very much :)